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f.1數一題only!!急

發問:

1.write down all the hexagonal numbers from 50 to 120. 寫六角形數50-120

最佳解答:

A hexagonal number is a figurate number, the number of points in the union of n hexagons with partly two common sides. The hexagonal number for n is given by the formula 2 * (n^2) (that is, 2 * n * n) ? n. Therefore, all the hexagonal numbers from 50 to 120 will be: 66, 91 , and 120. Proof: when n is 6, 2 * (n ^ 2) - n = 2 * 6 ^ 2 - 6 = 2 * 36 - 6 = 72 - 6 = 66 when n is 7, 2 * (n ^ 2) - n = 2 * 7 ^ 2 - 7 = 2 * 49 - 7 = 98 - 7 = 91 when n is 8, 2 * (n ^ 2) - n = 2 * 8 ^ 2 - 8 = 2 * 64 - 8 = 128 - 8 = 120

其他解答:

72,96,120 唔知岩唔知＋ 自己ｃｈｅｃｋ下！！！|||||What is 六角形數?

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